Internal-combustion-engine piston



Sept. 13,1927; 32

J. FABIAN INTERNAL COMBUSTION ENGINE PISTON Filed Oct. 5, 1923 Patented Sept. 13, 1927. 1

UNITED STATES PATENT OFFICE.

JUI|ES FABIAN, OF DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH COR- PORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

INTERNAL-COMBUSTIONENGINE PISTON.

Application filed October 8, 1923. Serial No. 666,264.

The present invention relates to pistons for internal combustion engines and in the preferred form of embodiment which has been chosen for the purpose of description and illustration relates to bimetallic pistons. j Among the objects of the invention is a light weight piston having the heat characteristics of aluminum or alloys thereof and the wearing qualitiesof iron.

such pistons and increase the ease of manufacture. f

Further objects and, advantages of the present invention will be apparent from the following description reference being had to the accompanying drawings, wherein a preferred form of embodiment of the present invention is clearly shown.

In the drawings:

Fig. 1 is an elevationof the piston partly in section.

Fig. 2 is a similar view at right angles to Fig. 1.

a Fig. 3 is a view of the piston, looking into the open end thereof.

In the drawings, the piston is made of two portions, a head portion 10 and a skirt portion 15. i

The head portion 10, which is preferably of aluminum or one of its alloys. is in the form of an inverted cup whose bottom 11 forms the head of the piston. The outer periphery of the cup is supplied with one or more grooves 12 in which are to be placed the usual packing rings. The inner periphery of the cup is also'grooved as at 13 for a purpose to be described later.

The skirt portion 15 is cylindrical in form and, for-the greater portion of its length, of slightly larger diameter than the head portion At its upper end the skirt porshape and may Another object is to reduce the cost of tion 15 has formed upon it a reduced cylin-' drical portion 16 which is of such a diameter that it will fit within the cup of the head portion 10. Skirt portion 15 is prefcrably of sheet iron or steel and drawn to itself be cup shaped with the reduced end closed.

The two parts. the head and skirt por tions are .secured together by fitting the part 16 into the cup of the head and ressing or otherwise forcing the metal 0 part 16 into the groove 13.

Skirt portion 15 is preferably perforated as at 20 and around perforations 20 are welded or otherwise secured bushings 21 forming bearings for the piston pin 22.

' While it has been stated that the head is preferably of aluminum and the skirt of iron or steel, it is obvious that other metals may be used and that both parts may be of the same metal with good results. The invention is therefore to be limited only to the scope of the claim which follows.

What I claim is as follows:

A bimetallic piston comprising a head portion of good heat-conducting metal in the form of a shallow cup provided upon its outer periphery with a groove, and a skirt portion of sheet metal having less heat conductivity but greater wear resistance than the metal of the head, the skirt portion being formed with a reduced cylindrical part adapted to be pressed into the cup-shaped head, the interior periphery of the head being provided with a recess into which'metal of the skirt portion is pressed to provide permanent attachment of the two portions.

In testimony whereof I hereto afiix my signature.

JULES FABIAN. 

